Ideal for those longer wellingtons, boots and waders, Heat Holders 2.3 TOG Boot Socks are long in the leg with a ribbed design and turn over tops, ready and able to keep you warm as only the originals can do. Heat Holders Boot Socks earn their official 2.3 TOG rating with specially designed high performance thermal yarn that features innovative knitting technology for an extra long loop, intensively brushed for a denser, deeper pile that can hold more warm air, making them 7x warmer than a basic cotton sock, and with superior moisture handling and breathability.